Sharp AY-XP7FR, AY-XP12FR, AE-X7FR Troubleshooting Guide, Self-Diagnosis Function and Display Mode

AYXP7FR

[8] TROUBLESHOOTING GUIDE

1. Self-Diagnosis Function and Display Mode

To call out the content of the self-diagnosis memory, hold down the emergency operation button for more than 5 seconds when the indoor unit is not operating.

•The number of indications displayed by the LEDs on the outdoor unit differs from that for the 2001 cooling unit models (for detailed display of mal- function information).

The display of malfunction No. differs from that of the 2001 cooling unit models. To show detailed malfunction information, two types of numbers flash alternately. (example: "21" ←→ "-0")

1)The content of the self-diagnosis memory can be called out and displayed on the seven-segment display section on the indoor unit. (The error data cannot be called out for display by the LED on the outdoor unit.)

2)If the power cord is unplugged from the AC outlet or the circuit breaker is turned off, the self-diagnosis memory loses the stored data.

a)The self-diagnosis display function of the indoor unit indicates the content of diagnosis by showing the error main category (number) and the error sub-category (-number) alternately in 1-second intervals on the seven-segment display section of the indoor unit.

Example of self-diagnosis display on indoor unit: Compressor high-temperature error

'TTQTOCKPECVGIQT[ 'TTQTUWDECVGIQT[

b)The self-diagnosis display function of the outdoor unit indicates the error information by flashing LED1 on the outdoor unit according to the con- tent of self-diagnosis.

The self-diagnosis display function of the outdoor unit is active only for about 3 to 10 minutes after self-diagnosis is performed during operation, and the display returns to normal condition after this display period.

The content of self-diagnosis cannot be called out by the self-diagnosis display function of the outdoor unit. Example of self-diagnosis display on outdoor unit: Compressor high-temperature error

ON OFF

1 sec 1 sec 0.6 sec 1 sec 0.6 sec 1 sec 1 sec

1 sec 0.6 sec 1 sec 0.6 sec 1 sec 1 sec

c) The content of diagnosis is transferred to the indoor unit via serial communication, but it does not trigger a complete shutdown operation.

: Flashes in 2-sec intervals (normal), : On, : Off, : Flashes 3 times in 0.2-sec intervals (When LED1 on the outdoor unit flashes in 2-sec intervals, the outdoor unit is in normal condition.)

Status of	Indication	Malfunction		Content of diagnosis		Inspection location/method		Remedy
indoor/	by LED1	No. dis-
outdoor	on out-	played on
units	door unit	main unit
	*2	display sec-
		tion *1
		Main	Sub-	Main category	Sub-category
		cate-	cate-
		gory	gory
Indoor/	Nor-	0	0		Normal	–		–
outdoor	mal
units in	flash-
operation	ing
Indoor/	1 time	1	-0	Outdoor unit	Heat exchanger	(1) Measure resistance of the	(1)	Replace the outdoor
outdoor				thermistor	thermistor short-cir-	outdoor unit thermistors.		unit thermistor assem-
units in				short-circuit	cuit error	(TH2 to TH5: Approx. 4.4		bly.
complete						kΩ at 25°C)
shutdown			-1		Outside tempera-	(2) Check the lead wire of the	(2)	Replace the outdoor
					ture thermistor	outdoor unit thermistor for		unit thermistor assem-
					short-circuit error	torn sheath and short-cir-		bly.
						cuit.
			-2		Suction thermistor	(3) No abnormality found in	(3)	Replace the outdoor
					short-circuit error	above inspections (1) and		unit control PWB
			-3		2-way valve ther-	(2).		assembly.
					mistor short-circuit
					error

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